History Keyword Cleaner от Andrey Pudov

What It Does

• Stores a comma-separated list of keywords in the extension options page.
• Runs a cleanup job on browser startup.
• Re-runs cleanup every 16 minutes using a browser alarm.
• Searches Firefox history for matching entries and removes matching URLs.
• Ignores duplicate keywords and avoids overlapping cleanup runs.

Matching is case-insensitive during cleanup. If any configured keyword appears in a history item's URL or title, that URL is deleted from history.